I agree with Fishtales on both accounts...very nice addition and the importance of protecting your coring. Merely putting sealant on the mounting bolts is not enough. Perhaps you are on top of it but if not, this is a good description of proper sealing of cored areas....especially the part about the bent nail. https://www.soundingsonline.com/features/installing-hardware-on-cored-decks
I'd also want to make sure there is sufficient metal on the top side. GW uses fairly large mounting plates ((3) 6"X8") that are welded to the rocket launcher. This ensures any stress is spread out across that area on the top. Hopefully there is some sort of plate on the topside of the hard top. Bolts alone would not be enough IMHO. Plates would be better and plates welded to the rocket launcher would be best.